If so, that's one thing. But based on my experience living in the south, that's not part of the culture.
And even if it was, it certainly was never acceptable to the extent AP meted it out to his son.
Relatedly, do you know that Ray Rice was brought up in a family culture where domestic abuse was considered less bad than how you and I view it? I don't know that either, but I'm certainly not going to use it as justification for what he did.
Both are grown men and are responsible for their actions.